(1b)
Natural sattelite is a celestial body in space that orbits a larger body, such as Moon Which moves around the Earth.
Artificial satellite is a machine of human creation that is sent to the space or the orbit of the Earth for the collection of data, communication and other ends

(2a)
Force is an agent that changes or tends to change the state of rest or of uniform motion in a straight line of a body

(2b)
Contact force is a force which is in contact with the body to which they are applied while Field force is a force whose sources do not require contact with the body to which the are applied
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(3a)
Maximum range (R) is defined as when the angle of the projection (Φ) is equal to 45° ie R = U²sin90/g and Φ=45°
R= U²sin90/g and sin90=1
Rmax=U²/g

(4a)
It means that the glycerine which is in solid state will require a heat of 13°c to change to liquid state

(4b)
(i) The S.I unit of mass is in kilogram (kg) while that of weight is in Newton (N)
(ii) Mass is the quantity of matter in a body while weight is the earth’s pull on a body
(iii) Mass is a scaler quantity while weight is a vector quantity
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(5)
The lower fixed point is determined by placing the thermometer upright in pure melting ice contained in a glass funnel as shown below:

When the mercury level remains steady, a mark is made on the stem of the thermomenter at this level which represents the lower fixed point
========================

(6)
Constructive interference is formed when the wave amplitudes reinforce each other, building a wave of even greater amplitude. Destructive interference is formed when the wave amplitudes oppose each other, resulting in waves of reduced amplitude.
========================

(7)
DRAWING

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(8a)
Faraday’s law states that the induced e.m.f. in a conducting circuit is directly proportional to the rate of change of magnetic flux linkage, Φ, with the circuit.

(13b)
Radius of the wheel = B
Radius of the axle = O
V. R= Distance moved by effort/ Distance moved by load
Effort moves through a distance is equal to the circumference of the wheel 2πB and at the same time interval the load moves through the axle 2πD
V.R=2πB/2πD =B/D

(13ci)
It breaks because ice is less dense than water and water expands when it is frozen

(13cii)
Evaporation takes place at all temperature while boiling takes place at a particular temperature (100°c)

(15a)
Electric field intensity is the measure of intensity or strength of electrical force per unit charge at any given point in the electric field. It is denoted by the letter E and its Unit is Newton per Coulomb (N/C). Where
F is force (N)
Q is Change (C)

(15bi)
A lead accumulator in charged by passing direct current (d.c) through it in the opposite direction to that which its supplies. The positive terminal of the d.c is connected to the positive terminal of the lead accumulator and the negative terminal of the d.c is connected to the negative terminal of the accumulator.

(15bii)
Electrolyte in battery is a solution of SO⁴ and H²O and over time can be lost by slight spills and evaporation and using distilled water it is free from additional minerals that can be find in tap water and these minerals can significantly decrease in life of batteries

(15ci)
Faraday’s law of electrolysis states that the chemical deposition due to the flow of current through an electrolyte is directly proportional to the quantity of electricity (coulombs) passed through it. i.e. mass of chemical deposition.

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